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Old Goose Creek Quarry (Arlington Stone Company Quarry; Belmont Quarry), Leesburg, Loudoun Co., Virginia, USAi
Regional Level Types
Old Goose Creek Quarry (Arlington Stone Company Quarry; Belmont Quarry)Quarry
Leesburg- not defined -
Loudoun Co.County
VirginiaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84):
39° 4' 7'' North , 77° 30' 58'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Belmont5,966 (2011)0.7km
Ashburn43,511 (2015)3.7km
Broadlands12,313 (2011)5.6km
University Center3,586 (2011)6.3km
Leesburg51,209 (2017)6.6km


Commodities (Major) - Stone - Crushed/Broken
Development Status: Past Producer
Approximately 220 yards NE of New Goose Creek quarry. Now abandoned and partially filled with water.

Known for exceptional apophyllite-(KOH) crystals. Meier and Kearns (2011) determined much if not all of the northern Virginia are uniformly near end-member apophyllite-(KOH) and verified its occurrence at this locality. (Lance Kearns, personal communication, 2011).

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


22 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Amphibole Supergroup var: Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Axinite Group'
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Calcite
Formula: CaCO3
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
'Chabazite'
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Clinochlore var: Diabantite
Formula: (Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Datolite
Formula: CaB(SiO4)(OH)
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Diopside
Formula: CaMgSi2O6
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Epistilbite
Formula: CaAl2Si6O16 · 5H2O
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Harmotome
Formula: (Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
'Heulandite subgroup'
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
'Hornblende'
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Hydroxyapophyllite-(K)
Formula: KCa4(Si8O20)(OH,F) · 8H2O
Reference: Meier, B. M. and Kearns, Lance E., 2011, Chemical Characterization of Northern Virginia Apophyllite, (K, Na)Ca4Si8)20(OH, F).8H2O, 38th Rochester Mineralogical Symposium Progran and Abstracts, p. 25-27.
'K Feldspar'
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Opal
Formula: SiO2 · nH2O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Pigeonite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: www.excaliburmineral.com
Quartz
Formula: SiO2
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Sphalerite
Formula: ZnS
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Stilbite subgroup'
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Thaumasite
Formula: Ca3(SO4)[Si(OH)6](CO3) · 12H2O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Thomsonite'
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Titanite
Formula: CaTi(SiO4)O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Wurtzite
Formula: (Zn,Fe)S
Reference: Minerals of Virginia 1990 by R. V. Dietrich

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Sphalerite2.CB.05aZnS
Wurtzite2.CB.45(Zn,Fe)S
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Thaumasite7.DG.15Ca3(SO4)[Si(OH)6](CO3) · 12H2O
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Diabantite9.EC.55(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Datolite9.AJ.20CaB(SiO4)(OH)
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Epistilbite9.GD.45CaAl2Si6O16 · 5H2O
Harmotome9.GC.10(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Hydroxyapophyllite-(K)9.EA.15KCa4(Si8O20)(OH,F) · 8H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Pigeonite9.DA.10(CaxMgyFez)(Mgy1Fez1)Si2O6
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Axinite Group'-
'Chabazite'-
'Heulandite subgroup'-
'Hornblende'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Stilbite subgroup'-
'Thomsonite'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
Wurtzite2.8.7.1(Zn,Fe)S
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 32 - COMPOUND SULFATES
Hydrated Compound Sulfates containing Hydroxyl or Halogen
Thaumasite32.4.4.4Ca3(SO4)[Si(OH)6](CO3) · 12H2O
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside65.1.3a.1CaMgSi2O6
Pigeonite65.1.1.4(CaxMgyFez)(Mgy1Fez1)Si2O6
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Epistilbite77.1.6.2CaAl2Si6O16 · 5H2O
Harmotome77.1.3.5(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Axinite Group'-
'Chabazite'-
Clinochlore
var: Diabantite
-(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
'Heulandite subgroup'-
'Hornblende'-
Hydroxyapophyllite-(K)-KCa4(Si8O20)(OH,F) · 8H2O
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Opal
var: Opal-AN
-SiO2 · nH2O
'Stilbite subgroup'-
'Thomsonite'-

List of minerals for each chemical element

HHydrogen
H Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
H Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
H DatoliteCaB(SiO4)(OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H EpistilbiteCaAl2Si6O16 · 5H2O
H Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H Opal (var: Opal-AN)SiO2 · nH2O
H ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
H OpalSiO2 · nH2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
OOxygen
O Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
O Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
O DiopsideCaMgSi2O6
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O CalciteCaCO3
O Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
O DatoliteCaB(SiO4)(OH)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O EpistilbiteCaAl2Si6O16 · 5H2O
O K Feldspar (var: Adularia)KAlSi3O8
O AlbiteNa(AlSi3O8)
O Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
O LaumontiteCaAl2Si4O12 · 4H2O
O MagnetiteFe2+Fe23+O4
O NatroliteNa2Al2Si3O10 · 2H2O
O Opal (var: Opal-AN)SiO2 · nH2O
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O QuartzSiO2
O ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
O TitaniteCaTi(SiO4)O
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O OpalSiO2 · nH2O
FFluorine
F Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AlbiteNa(AlSi3O8)
Na Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg DiopsideCaMgSi2O6
Mg Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al EpistilbiteCaAl2Si6O16 · 5H2O
Al K Feldspar (var: Adularia)KAlSi3O8
Al AlbiteNa(AlSi3O8)
Al Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Al LaumontiteCaAl2Si4O12 · 4H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
Si DiopsideCaMgSi2O6
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Si DatoliteCaB(SiO4)(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si EpistilbiteCaAl2Si6O16 · 5H2O
Si K Feldspar (var: Adularia)KAlSi3O8
Si AlbiteNa(AlSi3O8)
Si Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Si LaumontiteCaAl2Si4O12 · 4H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si Opal (var: Opal-AN)SiO2 · nH2O
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si QuartzSiO2
Si ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
Si TitaniteCaTi(SiO4)O
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si OpalSiO2 · nH2O
SSulfur
S SphaleriteZnS
S ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
S Wurtzite(Zn,Fe)S
ClChlorine
Cl Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
K K Feldspar (var: Adularia)KAlSi3O8
K Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
CaCalcium
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
Ca DiopsideCaMgSi2O6
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca EpistilbiteCaAl2Si6O16 · 5H2O
Ca Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti TitaniteCaTi(SiO4)O
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
MnManganese
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Fe Clinochlore (var: Diabantite)(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe MagnetiteFe2+Fe23+O4
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
ZnZinc
Zn SphaleriteZnS
Zn Wurtzite(Zn,Fe)S
BaBarium
Ba Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Jurassic
174.1 - 201.3 Ma



ID: 2761386
Diabase

Age: Early Jurassic (174.1 - 201.3 Ma)

Description: Fine- to coarsely-crystalline, subaphanitic or porphyritic with aphanitic margins; dark-gray mosaic of plagioclase laths and clinopyroxene, with some masses characterized by olivine or bronzite, others granophyric. Also occurs as dikes and sills in the Valley and Ridge, Piedmont, and Blue Ridge physiographic provinces.

Comments: Coastal Plain Original map source: Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

Lithology: Major:{basalt}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Jurassic
174.1 - 201.3 Ma



ID: 2460117
high-titanium quartz normative diabase

Age: Early Jurassic (174.1 - 201.3 Ma)

Description: Light- to dark-gray and dark-greenish-gray, chiefly medium-crystalline and porphyritic, but finely crystalline and aphanitic near chilled margins and in narrow dikes. Deeply weathered to orange-brown saprolite more than 6 m (20 ft) thick on uplands. Diabase of at least three principal magma types: 1) in places aphanitic diabase (Jdqh) encloses light- and dark-gray, layered, orthopyroxene-rich cumulate plugs and sheets; elsewhere encloses sheets containing light- and medium-gray, medium- to coarse-crystalline ferrogabbro, ferrodiorite, and pegmatoid, pinkish-gray to dark pink porphyritic granophyre and syenite, and finely crystalline aplite. Both types of diabase are magmatic derivatives of high TiO2, quartz-normative tholeiite (HTQ); unit Jdh is mainly an interlocking crystalline mosaic of calcic plagioclase and pyroxene. Differentiated sheets locally exceed 600 m (2000 ft) in thickness and dikes vary from a wedge-edge to 150 m (500 ft) wide. A whole-rock sample from unaltered diabase has yielded a nearly concordant 40Ar/39Ar age spectrum with a well-defined plateau age of 201.2+1.3 Ma (Sutter, 1988). This Early Jurassic age is interpreted to be a close approximation to the time of igneous intrusion, differentiation, and crystallization of the Centreville HTQ sheet and related diabase (Sutter, 1988). Another whole-rock sample from fresh LTQ diabase yielded a nearly concordant 40Ar/39Ar age spectrum with a fairly well-defined plateau age of 199.3+3.0 Ma for the Catlett sheet (Sutter, 1985). These age estimates are analytically indistinguishable, so at least to the temporal resolution possible by the 40Ar/39Ar technique, HTQ and LTQ diabase in the Culpeper basin are coeval.

Comments: gray, black; Dominant fractures folation; No fossils; differentiates of diabase sills; used for aggregate

Lithology: Diabase

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [69]

Triassic
201.3 - 251.902 Ma



ID: 3186382
Mesozoic intrusive rocks

Age: Triassic (201.3 - 251.902 Ma)

Comments: Culpeper Subbasin

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Meier, B. M. and Kearns, Lance E., 2011, Chemical Characterization of Northern Virginia Apophyllite, (K, Na)Ca4Si8)20(OH, F).8H2O, 38th Rochester Mineralogical Symposium Progran and Abstracts, p. 25-27.


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